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                  <p class="p_Heading1"><span class="f_Heading1">Lifeline Activation Levels</span></p>



  
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                <p class="p_BodyText"><span class="f_BodyText">Complicated processing systems can be easily negotiated and reflected in Sequence diagrams, by adding activation layers on a single lifeline. For example, a Class invokes the method</span><span class="f_BodyText" style="font-style: italic;"> Sample A</span><span class="f_BodyText">, which in turn calls </span><span class="f_BodyText" style="font-style: italic;">Sample A1</span><span class="f_BodyText">. To produce the arrangement in the diagram, select the </span><span class="f_MenuKeyField">More tools |</span><span class="f_BodyText"> </span><span class="f_MenuKeyField">Interaction </span><span class="f_BodyText">menu option, click on the </span><span class="f_MenuKeyField">Self-message</span><span class="f_BodyText"> icon in the </span><span class="f_UIControl">Interaction Relationships</span><span class="f_BodyText"> panel and then click on the lifeline.</span></p>
<p class="p_TextIndentedL2"><img src="sequence%20diagram%20self%20messages.png" width="204" height="224" border="0" alt="Sequence Diagram Self Messages"></p>
<p class="p_BodyText"><span class="f_BodyText">In order to raise the Activation level of </span><span class="f_BodyText" style="font-style: italic;">Sample A1</span><span class="f_BodyText">, click on the </span><span class="f_BodyText" style="font-style: italic;">raise arrow</span><span class="f_BodyText"> of the selected connector. The lifeline now visually depicts that method </span><span class="f_BodyText" style="font-style: italic;">Sample A1</span><span class="f_BodyText"> is called during the processing of </span><span class="f_BodyText" style="font-style: italic;">Sample A.</span></p>
<p class="p_TextIndentedL2"><img src="selfmessagelevels2.png" width="205" height="235" border="0" alt="SelfMessageLevels2"></p>
<p class="p_BodyText"><span class="f_BodyText">In the example below, a few more self-messages have been added. The message </span><span class="f_BodyText" style="font-style: italic;">Sample A2a</span><span class="f_BodyText"> is called from </span><span class="f_BodyText" style="font-style: italic;">Sample A2</span><span class="f_BodyText"> which in turn is called from </span><span class="f_BodyText" style="font-style: italic;">Sample A</span><span class="f_BodyText"> (not </span><span class="f_BodyText" style="font-style: italic;">Sample A1</span><span class="f_BodyText">). </span><span class="f_BodyText" style="font-style: italic;">Sample A1</span><span class="f_BodyText"> is called from</span><span class="f_BodyText" style="font-style: italic;"> Sample A</span><span class="f_BodyText">.</span></p>
<p class="p_TextIndentedL2"><img src="selfmessagemultlev2.png" width="249" height="287" border="0" alt="SelfMessageMultLev2"></p>




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